Left / Reight - Previos / next image
Up / Down - Image above / below
Space - Mark image (also shift-click)
Ctrl-A - Mark all images
Ctrl-D - Unmark all images
Ctrl-I - Reverse image marks
Enter - Toggle lightbox
Esc - Close image info or lightbox
Delete - Toggle image / marked for deletion (toggle)
Shift-Delete - Delete marked image(s) or current if none are marked
NOTE: if the grid behaves in an odd way on resize tweak PATCH_MARGIN value,
though this sould not be necessary.
(optimal range >1 and <3)
NOTE: the "basic actions" below are to be moved to the toolbar...
For more info see: README.md